Xing Lei, Liu Cheng-Gong, Li Qing-He, Duan Na, Li Hui-Qing, Sun Gao-Jie
Research Institute of Forestry, Chinese Academy of Forestry/Key Laboratory of Tree Breeding and Cultivation, National Forestry and Grassland Administration, Beijing 100091, China.
Experimental Center of Desert Forestry, Chinese Academy of Forestry, Dengkou 015200, Inner Mongolia, China.
Ying Yong Sheng Tai Xue Bao. 2020 Feb;31(2):366-372. doi: 10.13287/j.1001-9332.202002.019.
Ecological stoichiometry provides a new method for understanding the characteristics, driving forces and mechanisms of C, N and P coupled cycles. However, there are few reports on the variation in ecological stoichiometry of plants during their growth. In this study, we fitted the total elemental mass of different module based on the size of Nitraria tangutorum, and derived the ecological stoichiometry models of different module and whole ramet by measuring the biomass and nutrient concentrations of the current-year stems in 2017, 2-year-old stems, more than 2-year-old stems, leaves, roots and layerings of N. tangutorum ramet. Our results showed that the derivation model could well reflect the changes in ecological stoichiometry during plant growth. The old stems and the layering had higher N:P and C:P, while leaves,current-year stems, and roots had lower N:P and C:P. The whole plant nutrient elements cumulative rate was P:N:C during the growth process. These results were consistent with the growth rate hypothesis and allometric theory, and provide evidence for nutrient reabsorption. This model could be used as an effective way to analyze the dynamic characteristics of elements in plant growth.
生态化学计量学为理解碳、氮和磷耦合循环的特征、驱动力及机制提供了一种新方法。然而，关于植物生长过程中生态化学计量学变化的报道较少。在本研究中，我们根据唐古特白刺的大小拟合了不同构件的总元素质量，并通过测定2017年当年生茎、2年生茎、2年以上生茎、叶、根以及唐古特白刺分株的分层的生物量和养分浓度，推导出不同构件和整个分株的生态化学计量学模型。我们的结果表明，推导模型能够很好地反映植物生长过程中生态化学计量学的变化。老茎和分层具有较高的N:P和C:P，而叶、当年生茎和根具有较低的N:P和C:P。在生长过程中，整株植物营养元素的累积速率为P:N:C。这些结果与生长速率假说和异速生长理论一致，并为养分重吸收提供了证据。该模型可作为分析植物生长过程中元素动态特征的有效方法。
